using System;
using System.Collections.Generic;
using System.IO;
using SharpCompress.Common;
using SharpCompress.Readers;
using SharpCompress.Readers.Tar;
using SharpCompress.Test.Mocks;
using Xunit;

namespace SharpCompress.Test.Tar;

public class TarReaderTests : ReaderTests
{
    public TarReaderTests() => UseExtensionInsteadOfNameToVerify = true;

    [Fact]
    public void Tar_Reader() => Read("Tar.tar", CompressionType.None);

    [Fact]
    public void Tar_Skip()
    {
        using (
            Stream stream = new ForwardOnlyStream(
                File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar"))
            )
        )
        using (IReader reader = ReaderFactory.Open(stream))
        {
            int x = 0;
            while (reader.MoveToNextEntry())
            {
                if (!reader.Entry.IsDirectory)
                {
                    x++;
                    if (x % 2 == 0)
                    {
                        reader.WriteEntryToDirectory(
                            SCRATCH_FILES_PATH,
                            new ExtractionOptions() { ExtractFullPath = true, Overwrite = true }
                        );
                    }
                }
            }
        }
    }

    [Fact]
    public void Tar_BZip2_Reader() => Read("Tar.tar.bz2", CompressionType.BZip2);

    [Fact]
    public void Tar_GZip_Reader() => Read("Tar.tar.gz", CompressionType.GZip);

    [Fact]
    public void Tar_LZip_Reader() => Read("Tar.tar.lz", CompressionType.LZip);

    [Fact]
    public void Tar_Xz_Reader() => Read("Tar.tar.xz", CompressionType.Xz);

    [Fact]
    public void Tar_BZip2_Entry_Stream()
    {
        using (Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.bz2")))
        using (var reader = TarReader.Open(stream))
        {
            while (reader.MoveToNextEntry())
            {
                if (!reader.Entry.IsDirectory)
                {
                    Assert.Equal(CompressionType.BZip2, reader.Entry.CompressionType);
                    using (var entryStream = reader.OpenEntryStream())
                    {
                        string file = Path.GetFileName(reader.Entry.Key);
                        string folder =
                            Path.GetDirectoryName(reader.Entry.Key)
                            ?? throw new ArgumentNullException();
                        string destdir = Path.Combine(SCRATCH_FILES_PATH, folder);
                        if (!Directory.Exists(destdir))
                        {
                            Directory.CreateDirectory(destdir);
                        }
                        string destinationFileName = Path.Combine(destdir, file);

                        using (FileStream fs = File.OpenWrite(destinationFileName))
                        {
                            entryStream.TransferTo(fs);
                        }
                    }
                }
            }
        }
        VerifyFiles();
    }

    [Fact]
    public void Tar_LongNamesWithLongNameExtension()
    {
        var filePaths = new List<string>();

        using (
            Stream stream = File.OpenRead(
                Path.Combine(TEST_ARCHIVES_PATH, "Tar.LongPathsWithLongNameExtension.tar")
            )
        )
        using (var reader = TarReader.Open(stream))
        {
            while (reader.MoveToNextEntry())
            {
                if (!reader.Entry.IsDirectory)
                {
                    filePaths.Add(reader.Entry.Key);
                }
            }
        }

        Assert.Equal(3, filePaths.Count);
        Assert.Contains("a.txt", filePaths);
        Assert.Contains(
            "wp-content/plugins/gravityformsextend/lib/Aws/Symfony/Component/ClassLoader/Tests/Fixtures/Apc/beta/Apc/ApcPrefixCollision/A/B/Bar.php",
            filePaths
        );
        Assert.Contains(
            "wp-content/plugins/gravityformsextend/lib/Aws/Symfony/Component/ClassLoader/Tests/Fixtures/Apc/beta/Apc/ApcPrefixCollision/A/B/Foo.php",
            filePaths
        );
    }

    [Fact]
    public void Tar_BZip2_Skip_Entry_Stream()
    {
        using (Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar.bz2")))
        using (var reader = TarReader.Open(stream))
        {
            List<string> names = new List<string>();
            while (reader.MoveToNextEntry())
            {
                if (!reader.Entry.IsDirectory)
                {
                    Assert.Equal(CompressionType.BZip2, reader.Entry.CompressionType);
                    using (var entryStream = reader.OpenEntryStream())
                    {
                        entryStream.SkipEntry();
                        names.Add(reader.Entry.Key);
                    }
                }
            }
            Assert.Equal(3, names.Count);
        }
    }

    [Fact]
    public void Tar_Containing_Rar_Reader()
    {
        string archiveFullPath = Path.Combine(TEST_ARCHIVES_PATH, "Tar.ContainsRar.tar");
        using (Stream stream = File.OpenRead(archiveFullPath))
        using (IReader reader = ReaderFactory.Open(stream))
        {
            Assert.True(reader.ArchiveType == ArchiveType.Tar);
        }
    }

    [Fact]
    public void Tar_With_TarGz_With_Flushed_EntryStream()
    {
        string archiveFullPath = Path.Combine(TEST_ARCHIVES_PATH, "Tar.ContainsTarGz.tar");
        using (Stream stream = File.OpenRead(archiveFullPath))
        using (IReader reader = ReaderFactory.Open(stream))
        {
            Assert.True(reader.MoveToNextEntry());
            Assert.Equal("inner.tar.gz", reader.Entry.Key);

            using (var entryStream = reader.OpenEntryStream())
            {
                using (FlushOnDisposeStream flushingStream = new FlushOnDisposeStream(entryStream))
                {
                    // Extract inner.tar.gz
                    using (var innerReader = ReaderFactory.Open(flushingStream))
                    {
                        Assert.True(innerReader.MoveToNextEntry());
                        Assert.Equal("test", innerReader.Entry.Key);
                    }
                }
            }
        }
    }

    [Fact]
    public void Tar_Broken_Stream()
    {
        string archiveFullPath = Path.Combine(TEST_ARCHIVES_PATH, "Tar.tar");
        using (Stream stream = File.OpenRead(archiveFullPath))
        using (IReader reader = ReaderFactory.Open(stream))
        {
            var memoryStream = new MemoryStream();

            Action action = () => reader.MoveToNextEntry();
            var exception = Record.Exception(action);
            Assert.Null(exception);
            reader.MoveToNextEntry();
            reader.WriteEntryTo(memoryStream);
            stream.Close();
            Assert.Throws<IncompleteArchiveException>(action);
        }
    }

#if !NETFRAMEWORK
    [Fact]
    public void Tar_GZip_With_Symlink_Entries()
    {
        var isWindows = System.Runtime.InteropServices.RuntimeInformation.IsOSPlatform(
            System.Runtime.InteropServices.OSPlatform.Windows
        );
        using (
            Stream stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "TarWithSymlink.tar.gz"))
        )
        using (var reader = TarReader.Open(stream))
        {
            List<string> names = new List<string>();
            while (reader.MoveToNextEntry())
            {
                if (reader.Entry.IsDirectory)
                {
                    continue;
                }
                reader.WriteEntryToDirectory(
                    SCRATCH_FILES_PATH,
                    new ExtractionOptions()
                    {
                        ExtractFullPath = true,
                        Overwrite = true,
                        WriteSymbolicLink = (sourcePath, targetPath) =>
                        {
                            if (!isWindows)
                            {
                                var link = new Mono.Unix.UnixSymbolicLinkInfo(sourcePath);
                                if (File.Exists(sourcePath))
                                {
                                    link.Delete(); // equivalent to ln -s -f
                                }
                                link.CreateSymbolicLinkTo(targetPath);
                            }
                        }
                    }
                );
                if (!isWindows)
                {
                    if (reader.Entry.LinkTarget != null)
                    {
                        var path = System.IO.Path.Combine(SCRATCH_FILES_PATH, reader.Entry.Key);
                        var link = new Mono.Unix.UnixSymbolicLinkInfo(path);
                        if (link.HasContents)
                        {
                            // need to convert the link to an absolute path for comparison
                            var target = reader.Entry.LinkTarget;
                            var realTarget = System.IO.Path.GetFullPath(
                                System.IO.Path.Combine(
                                    $"{System.IO.Path.GetDirectoryName(path)}",
                                    target
                                )
                            );

                            Assert.Equal(realTarget, link.GetContents().ToString());
                        }
                        else
                        {
                            Assert.True(false, "Symlink has no target");
                        }
                    }
                }
            }
        }
    }
#endif
}
